Looks like a retic to me... hard to say from those. We all know a snake can eat it's own body weight in one go so if a retic gets to be 150-180 pounds or so it could easily eat any one of the people in those pics. I saw a show where an African Rock swallowed a gazelle, giant horns and all so a person of average size wouldn't even be a challenge to a snake that big. On the other hand maybe the pics are fake... Maybe it's that David Blane a**hole, going a real long way for what passes for a magic trick. Or it's the boys from Jackass: "Hi, I'm Johnny Knoxville and this is being eaten by a snake".
I feel a little light headed... maybe you should drive...